Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 69, Issue 3-4, Pages 365-372Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2008.10.024
Keywords
Carbon nanotubes; Nanocomposites; Electrical properties; Rheology; Injection moulding
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Funding
- Department of Science & Technology (DST), India [04DS047]
- Microcompouder Central facility
- SEM Central Facility
- SAIF IIT Bombay
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Multiwall carbon nanotubes (MWNT) were incorporated in melt-mixed co-continuous blends of polyamide 6 (PA6) and acrylonitrile-butadiene-styrene (ABS) using a conical twin-screw microcompounder. The state of dispersion of MWNT in the blends was assessed through AC electrical conductivity measurements and melt-rheological investigations. The electrical and rheological percolation threshold in PA6/ABS blends was similar to 3-4 and similar to 1-2 wt% MWNT, respectively. A unique reactive modifier (sodium salt of 6-amino hexanoic acid, Na-AHA) was employed to facilitate 'network-like' structure of MWNT and to confine them in a specific phase. This was achieved by establishing specific interactions with the delocalized 'pi-electron' clouds of MWNT and melt-interfacial reaction during melt-mixing. The electrical percolation threshold was significantly reduced in the blends (similar to 0.25 wt%) in the presence of Na-AHA modified MWNT and even coincided with the rheological percolation threshold. Significant refinement in the co-continuous structure was also observed in the presence of Na-AHA modified MWNT. (C) 2008 Elsevier Ltd. All rights reserved.
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